Route Handlers (API बनाएँ)

// app/api/courses/route.js  (from the EduSite project)
import { searchCourses } from '@/lib/courses'

// GET /api/courses?q=python  →  JSON list of matching courses.
export async function GET(request) {
  const q = request.nextUrl.searchParams.get('q') || ''
  const data = searchCourses(q).map(({ slug, title, level, fee, duration }) =>
    ({ slug, title, level, fee, duration }))
  return Response.json({ count: data.length, courses: data })
}

// app/api/enquiries/route.js
import { NextResponse } from 'next/server'

const enquiries = []   // demo only – use a database in real apps

export async function GET() {
  return NextResponse.json(enquiries)
}

export async function POST(request) {
  let body
  try {
    body = await request.json()
  } catch {
    return NextResponse.json({ error: 'Invalid JSON' }, { status: 400 })
  }

  const name = String(body.name || '').trim()
  const phone = String(body.phone || '').trim()
  if (name.length < 2 || !/^[6-9]\d{9}$/.test(phone)) {
    return NextResponse.json({ error: 'Name and a valid 10-digit mobile are required' }, { status: 422 })
  }

  const item = { id: enquiries.length + 1, name, phone, at: new Date().toISOString() }
  enquiries.push(item)
  return NextResponse.json(item, { status: 201 })   // 201 = Created
}

// app/api/courses/[slug]/route.js
import { getCourse } from '@/lib/courses'

export async function GET(request, { params }) {
  const { slug } = await params              // params is a Promise here too
  const course = getCourse(slug)
  if (!course) {
    return Response.json({ error: 'Course not found' }, { status: 404 })
  }
  return Response.json(course)
}

// app/api/courses/route.js — allow any origin to read (public API)
const cors = {
  'Access-Control-Allow-Origin': '*',
  'Access-Control-Allow-Methods': 'GET, POST, OPTIONS',
  'Access-Control-Allow-Headers': 'Content-Type, Authorization',
}

export async function OPTIONS() {               // browser "preflight" request
  return new Response(null, { status: 204, headers: cors })
}

export async function GET(request) {
  const data = { ok: true }
  return Response.json(data, { headers: { ...cors, 'Cache-Control': 'public, max-age=60' } })
}

// From any JavaScript (browser console, another site, React Native):
const res = await fetch('https://your-site.com/api/courses?q=web')
const json = await res.json()
console.log(json.count, json.courses[0].title)